Combination pivot pin and bushing device



Jan. 19, 1960 M. s. RIFKIN COMBINATION PIVOT PIN AND BUSHING DEVICE Filed Feb. 28, 1957 INVENTOR. MORTON S. RIFKIN AT TORNEY United. States Patent COMBINATION PIVOT PIN AND BUSHING DEVICE Morton S. Rifliin, Miami, Fla., assignor to R. B. Leonard, Inc., Miami, Fla., a corporation of Florida Application February 28, 1957, Serial No. 643,149

2 Claims. (Cl. 30822) This invention relates to pivot members and is more particularly directed to a combination pivot pin and bushing device made of moldable plastic such as nylon and the like.

A principal object of the present invention is to provide levers, links, etc. with a combination pivot pin and bushing device made of plastic material which device elimr inates metal to metal contact between the pivoted parts thereby reducing friction and wear to a minimum.

A further object of the present invention is the provision of a combination pivot pin and bushing device in which the pivot pin portion is locked in position in the bushing portion and the bushing portion securely mounted on the lever, link, etc. which it is positioned.

A further object of the present invention is to provide a combination pivot pin and bushing device described as above which provides a solid body of plastic material at the point of greatest shear thereby eliminating .the possibili'ty of failure of the device. g

A still further object of the present invention is the provision of a combination pivot-pin and bushing device 0 pivot pin to slide or operating bars 16. There isan which is readily installed and dismounted without the necessity of using other than ordinary tools and which may be reused without impairing its gripping qualities.

A still further object of the present invention is to provide a combination pivot pin and bushing device made of plastic material and characterized as above wherein the pivot pin portion compels the plastic material of the bushing portion to form a shoulder for securely locking the device in position.

With these and other objects in view, the invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing forming a part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawing but may be' changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

Figure 1 is a perspective view of an awning window on whose operating mechanism my combination pivot pin and bushing devices are shown.

Figure 2 is a sectional viewtaken along the line 2-2 of Figure 1 showing the manner in which my pivot devices are mounted thereon.

Figure 3 is a cross sectional view at the position of my pivot device, taken along the line 33 of Figure 2.

Figure 4 is a similar View showing -my combination pivot pin and bushing device prior to the insertion of the pivot pin.

' Figure 5 is a cross sectional view taken along the line 5-5 of Figure 2 showing a modified pivot device adapted to accommodate more than two pivoted members.

Figure 6 is an exploded view thereof.

Referring to the drawing wherein like numerals are used to designate similar parts throughout the several operating bar 16 slidably mounted adjacent each 'jamb 12 with their lower ends pivotally mounted by a pivot pin 17 to a link 18.

To the lower ends of the hinge plates 14 there is secured by a pivot pin 20, one end of a hinge support link 21 whose lower end is pivotally mounted by a pivot pin 23 to a plate member 24 adjustably secured to the jambs 12 by fasteners or bolts 22. s

On one of the jambs 12 there is secured a conventional operator 25 on which is mounted a crank 26 operatively connected to a power arm 27 by worm and gear connection (not shown) for swinging the power arm 27 in the opening and closing of the vents 13. The free end of the power arm 27 is connected to one end of a torque link 28 by a pivot pin 29. The lower ends of the link 18 and the torque link 28 are secured by a pivot pin 30 pivotally mounted on the upper end of a torque arm 31 whose lower end is secured'to a cross shaft 32 extending from one jamb 12 to another jamb 12. On the side of the window frame 11 opposite that shown by Figure 2, a torque arm 31 shown is secured to the cross shaft 32 and has its free end pivotally secured by a pivot pin similar to the pivot pin 30 to a link as is the link 18 whose other end is pivotally secured to the slide or operating bar 16. Upon actuating the operator 25, the power arm 27 is made to swing carrying carrying the torque link 28 which causes the torque arm 31 on the side nearest the operator 25 to efiiect rotational movement of the cross shaft 32. The torque arm 31 adjacent the jamb 12 removed from the operator 25 will now act in unison with the torque arm shown to swing the link 18 and slide the operating bars 16 upwardly or downwardly to effect the closing or opening of the vents 13.

The pivot pins 20, 23, 29 and 30 which form the subject matter of the present invention are made of plastic or like material and operate as both a bushing and a pivot pin. The pivot pins 20 and 29 designated by the letter A in Figures 3 to 5 are identical in construction while the pivot pin 30 shown by Figure 6 is slightly modified in construction as is explained in detail hereinafter.

The pivot pins A as best shown by Figures 35 inclusive consist of two separable parts, a bushing portion 32 and a pin portion 33.

The bushing portion 32 is cylindrical in cross section and provided with a peripheral shoulder 34 extending about the bushing portion 32 at approximately the mid portion thereof to form cylindrical portions 35 and 36. The dimensions'of the outside diameters of the portions 35 and 36 are determined by the size of the bores 37 and 38 of the members 14 and 21 respectively, the cylindrical portion 36 fitting loosely in the member 21 to permit the latter to pivot freely thereabout.

The bushing portion 32 is further provided with a centrally disposed bore 39 which is of uniform diameter along a portion of its length to approximately the position of the shoulder 34 and then tapers inwardly as at 40 approaching the other end of the cylindrical portion 35. The tapered end 40 is scored or grooved as at 41 to form peripherally disposed ridges.

The pin portion 33 consists of a head 42 mounted on a shaft or pin 43 whose free end 44 is scored as at 45 in the same manner as the ridges 41 of the tapered bore 40'. The cylindrical pin 43 is of such size as to fit snugly but freely in the bore 39 of the bushing portion 32, while the free end 44 isslightlyrounded asat 46. l A 1 lnmounting the Combination bushing and pin A in position the bushing portion 32 is inserted in the bore 37 of the'member14 until the shoulder 34 is in contact relation With the member 14 and the free end of the cylindrical portion 35 extends beyond the outer side wall of the-rnember,14. The bore 38 of the member 21 is now fitted over the cylindrical portion 36fslid therealong until the member 21 is in close proximity to the shoulder 34. Now the pin por tion 33 is taken and the free end 44 of the pin 43 inserted in the bore 39 of the bushing portion 32. The pin portion 33 willfslide freely until the, free end 44 of the pin 43 arrives at the position of the flared bore 40. With an increased force or a blow of a hammer applied on the head 42, the pin 43 will slide forwardly in the bore-40 forcing the plastic material of which the bushing portion is constructed to expand so as to fit tightly in the bore 37 and overlap the outside surface of the member 14 as at 48 since the bore 40 is smaller in diameter than that of the pin 43. The bushing portion 32 becomes locked securely in the member 14 while the pin portion .33 is securely locked together with bushing portion 32 by the interlocked 36a and the torque arm 31 is positioned on the cylindrical portion 36a. The pivot pin 33 is inserted in the, bore 39 and forced inwardly until properly housed as shown by Figure 5.

Each of the members 18, 28 and 31 are spaced from each other so as not to be in frictional contact with each other. Also, the pin portion 33.is locked in position in the bushing portion 32 while the bushing portion 32 is secured against removal therefrom by the overlapping material 48 formed at, the outer surface of the link 18 in the same manner as described hereinabovewith relation to the combination bushing and'pivot pin A.

What I claim as new is:

1. A device of the class described comprising a cylindrical member having end portions, a peripheral shoulder extending about said cylindrical member intermediate said end portions, said cylindrical member having a bore of constant diameter extending fromv one; end of said cylindrical member to a position intermediate said end portions and diminishing in diameter in the direc tion of said other end portion, a plurality of ridges formed on said inwardly flaring portion of said bore, a pin'member having a cylindrical body portion substantially equal in-diameter to said constant diameter of ridges 41 and 45 of the bushing portion 32 and the pin portion 33 respectively; As long as the pin portion 33 remains properly housed in the bushing portion 32, the members 14 and 21 cannot becornedisengaged therefrom. The link 21 now may pivot freely about the cylindrical portion 36 With the head 42 operating as a stop member on one side andthe shoulder 34 acting as a washer imposed between the metallic members 14 and 21, thereby preventing the members 14 and 21 to come into frictional contact with each other.

If it is desired to disassemble the members 14 and 21, all that need be done is removethe pin portion 32 by inserting a tool such as a screw driver under the head 42 and prying the pin 43 out of the bushing portion 32 topermit the member 21 to be removedfrom its position on the cylindrical portion 36. To reassemble, the member 21 is returned to its position as shown and the pin portion 33. forced back to its housed position. It is to be noted, that theposition of the shoulder 34- of the bushing portion 32 which is the position of greatest shear and stress,-is formed of solid plastic material, thereby rendering the combination bushing and pin device A capable of withstanding large forces without failing or givingrise to high frictional effects.

Referring now to Figures 5 and 6, there is shown a similarcombination bushing and pin modified in construction for pivotally mounting the link 18, torque link 28 and torque arm 31. v a

The plastic member 30 is similar to member A except that the cylindrical portion 36a and the pin 43a of the former is longer than'the cylindrical portion 36 and the pin 43 of the member A, these parts being longer to accommodate the three pivoted members 18, 28 and 31. However in order to prevent thetorque link 28 from coming into frictional contact with the torque arm 31 there is interposed therebetween a plastic floating washer 50.

In assemblying the combination bushing and pivot pin 30, the cylindrical portion is inserted in the bore of the link 18 then the torque link 28 is slipped over the cylindrical portion 36a until the link 28 is positioned adjacent the shoulder34. Now the floating washer 50 is slipped over the free end of the cylindrical portion said bore, a head mounted on one end of said cylindrical body portion and a plurality of ridges mounted on the other end of said cylindrical body portion whereby upon the receiving of said pin member by said bore of said cylindrical member said otherend portion of -said cylindrical member forms ashoulder extending beyond the outer surface of said cylindrical member and said ridges of said bore and said cylindrical body portion intereng-aging to lock said members together.

A combination pivot pin and bushing device for pivotally mounting a plurality of members having bores comprising a cylindrical member adapted to be received by saidbores, a peripheral shoulder extending about said cylindrical member and adapted to be positioned between said pivoted members, said cylindrical member having a bore of constant diameter along one end of said cylindrical member and diminishing in diameter in the direction of the other end thereof, a plurality of peripheralridgesformed on said bore at, said other end, a pin-member having a cylindrical body portion of substantially equal diameter as that of said bore as said one end of said cylindrical member, a cap mounted on one end of said cylindrical body portion, and peripheral ridges formed on the other end of. said cylindrical body whereby upon the insertion of said pin member in said bore of said cylindrical member said ridges of said bore at said other end of said cylindrical member and on said pin member become interengaged to lock together said pin'member and cylindrical member and said cylindrical member becomes expanded in one of said pivoted membersand forms an outwardly extending shoulder in contact relation with said one of said pivoted members to lock together said cylindrical member and said one of said pivoted members.

References Cited in the file of this patent UNITED STATES PATENTS Austria Jan. 10, 

